ago 与 before的用法区别
[1]before单词记忆法◆记忆方法一：联想方式：be: 是;for: 为了;e: 鹅丑小鸭以前做的一切是为了可以变成白天鹅◆记忆方法二：联想方式：be: 是;for: 为了;e: 鹅记忆方法：丑小鸭以前做的一切是为了可以变成白天鹅◆记忆方法三：联想方式：be: 是;for: 为了;e: 鹅
记忆方法：丑小鸭以前做的一切是为了可以变成白天鹅◆记忆方法四：词根词缀记忆法：before在前面（be+fore
(1) 两者均可表示在多久时间“以前”(要放在表示一段时间的词语之后)，但有区别：ago 从现在向前回溯，即现在的过去，因此通常与一般过去时连用;而 before 则从过去向前回溯，即指过去的过去，因此通常与过去完成时连用(尤其用于宾语从句中)。如：
[2]宾语,从句,相关知识点可用作except宾语的6种不同从句I'm as good a cook as she is except when it comes to (making) pastry. 我做饭做得和她一样好, 就是不会做油酥馅饼。The old lady never spoke to anyone except when someone came to visit her. 老太太从来不
I bought the computer two years ago. 我是两年前买这台电脑的。
He said they had left five days before. 他说他们 5 天前就离开了。
注：在表示推测或为使语境生动的句子中，有时也可用 ago 代替before。如：
He must have left a week ago. 想必他在一星期前就离开了。
[3]must,have,相关知识点must have V-ed ...句型结构分析语法讲解：句子成分、什么句型句法，怎么用什么意思 They must have read the article. 他们一定读过这篇文章。 You must have seen him before. 你以前一定见过他。 He must have forgotten my name. 他一定忘了我的名字。
I had thought that he had died at least 20 years ago. 我原以为他至少在 20 年前就已经去世了。
(2) before 有时单独使用(即不连用具体时间)，泛指一般意义的“以前”，此时可用于一般过去时，也可用于现在完成时。如：
[4]现在完成时,一般过去时,相关知识点知识点1:现在完成时转换成一般过去时现在完成时可以转化成一般过去时，还可以转化成“It is/has been +时间段+since从句(用一般过去时)”等句型。e.g. Jim has been back for a month. 吉姆已经回来一个月了。 = Jim came back a month ago. 吉姆一个月前就回来了[1]back,ca
He didn't know that before. 他以前不知道此事。
I have been there before. 我以前去过那儿。
[5]have been,have,相关知识点 have been to / have been in / have gone toⅠ. have been to … 表示：“曾经到过某处”但目前人未在那儿。如：① Where have you been? 你到哪儿去了？（现在已回来）I have been to Beijing. 我去北京了。（现不在北京）② I have never been there before,
ago相关单词意思与记忆法：
ago单词意思解释释义：
ad. 以前
ago单词记忆法：
◆记忆方法一：
联想方式：a：一；go：去
以前事情一去不复返
◆记忆方法二：
分析：a——一个；go——去；
记忆方法：一个人总想去以前去过的地方；
◆记忆方法三：
联想方式：a：一；go：去
记忆方法：以前事情一去不复返
ago单词相关例句：These palaces record were copied out three and a half thousand years ago by an egyptian scribe.
这些宫廷的记录是三千五百年前一位埃及的抄写员抄出来的。
From the point of view of evolution, men originated millions of years ago from the anthropoid, a species commonly referred to as the ape man.
从进化的观点来看，人类起源于几百万年前的类人猿，通常又称作猿人。
The warranty lapsed two months ago .
那项保证两个月前失效了。
直接引语 间接引语 now then ago before today that day this morning that morning yesterday the day before yesterday morning the morning before tomorrow the next day,the following day,the day after last week(month,etc) the week(month,etc) before next week(month,etc) the week(month,etc) after,the following week(month,etc) this week(month,etc) that week(month,etc) here there "I'll come and see you again this evening,Tom."he said.
直接引语 间接引语 this that these those now then ago before/earlier today that day yesterday the day before tomorrow the next/following day the day after tomorrow In two day’s time come go here there the day before yesterday two days before/earlier
yesterday the day before two days ago two days before
this day week 意为“一周后的今天”，类似地，this day year 则表示“一年后的今天”。比较：six months ago today 的意思是“半年前的今天”，10 years ago today 的意思是“10年前的今天”。
Many years ago there lived an old man in the wooden house.
It was about 600 years ago that the first clock with a face and an hour hand was made. 第一面带有一个钟面和一根时针的钟是在大约600年前制造的。
How long ago is it that you last saw her? 你上一次看见她是多久以前的事?
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